-Arnolds thick book. I respect bodybuilding/bodybuilders and the hard work it requires, however its popularity has had a negative affect on strength training.
-Many general fitness type folk don't know the difference between strength training and mass training.
-Misinformation in mainstream media: magazines, books, television commercials.
-Exercise machine industry$$$
-Horrible personal trainers at commercial gyms.
-Misinformed elementary and secondary school gym teachers
-Misinformed high school sports coaches.